Brake material and process connected therewith



y M. M. CUNNINGHAM ET AL 2,081,578

BRAKE MATERIAL AND PROCESS CONNECTED THEREWITH Filed May 2, 1932 IN V EN TORS Mar/on M Cunmhgham.

By Char/es E fimd/e ATTORNEY 7 Patented May 25, 1937 i UNITED STATES PATENT OFFICE BRAKE MATERIAL AND PROCESS CONNECTED THEREWITH Marion M. Cunningham and Charles E. Bradley,

South Bend, Ind., assignors to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware, and Mishawaka Rubber and Woolen Manufacturing Company, Mishawaka, Ind., a corporation of Indiana Application May 2, 1932, Serial No. 608,787

1 Claim. (01. 106-23) This invention relates to brake materials and churn for approximately 12 hours until it is thorprocesses connected therewith. In particular, it oughly dissolved to a uniform paste-like mortar. relates to a compound for filling any spaces which The mortar produced by this process is spread may exist between the metal brake band or shoe upon the surface of the metallic brake band as 5 and the lining and for providing a solid ioundaa paint and immediately thereafter the brake 5 tion for the lining. lining is applied to the band and forced tightly In servicing brakes where relining is necessary, into contact therewith so that the mortar is we have found it advisable to have some material forced into any space which might otherwise be to apply on the metal brake band or shoe to left between the band and the lining. The linsmoothits surface where it may have been pitted ing is then riveted to the band. While we prefer 10 from wear and to correct its curvature where it to use the mortar described above, we have found may have been distorted through service, in order that lead oxide paint or zinc oxide paint may be 5 that the brake lining will fit snugly and have a substituted for the compound described and used smooth solid base for attachment. Such matein a process similar to that described, whereupon rials will not work satisfactorily if they run under very fair results are obtained, the paint serving 16 pressure or heat or if they vulcanize with the as a mortar. metal. The high percentage of sulphur in this com- One of the objects of this invention is to provide pound vulcanizes the material slowly into hard a suitable compound for filling the spaces between rubber under application of heat, the heat being 20 a metallic brake element and an associated brake furnished by the friction on the brake lining and 20 lining whereby a solid base on which the brake the cooperating surface. The phenolic resin inlining may rest is provided. sures that the mortar shall dry quickly and have A further object is to provide processes of forma quick setting or stiffening. The shrinkage or ing and using such a compound. loss from evaporation is very loW due to the rela- A more specific object of the invention is to tively small content of solvent. 25 provide such a compound which can be satisfac- The compound described has many advantages torily hardened, which will not adhere to the including the following: It will not run out durmetal, and which will not subsequently be alfected ing the process of applying the band; it will dry by heat. quickly and the relining operation may be accom- A further object of the invention is to provide plished quickly, this being an effect of the phesuch a material which will dry quickly after nolic resin. Under the influence of the heat of application. application, it becomes homogeneous with the Further objects of the invention will be apparlining, thereafter not being aifected by heat. It

out after a reading of the subjoined specification forms a solid base for the lining to rest upon. It

and claim and after a consideration of the atis to be noted that the compound, when dry, is 35 tached drawing, in which: very similar to that of the brake lining itself Figure 1 is a side view in elevation of a brake which aids in accomplishing the homogeneity of shoe; and the lining and the mortar. Figure 2 is a View in vertical section and on an It is to be understood that the above described enlarged scale of the shoe shown in Figure 1. embodiment of the invention is for the purpose 40 It may be seen that the shoe illustrated is of illustration only and various changes may be formed of a metallic band l2 to which there is made therein without departing from the spirit secured a strip of brake lining M by means of and scope of the invention. rivets l6. Interposed between the band l2 and We claim:

the lining I4 is a mortar I8. A composition of matter for use in applying 45 The mortar used in attaching the liner M to friction brake lining to metal brake shoes comthe band I2 is preferably formed as follows: We prising a compound including by weight appromthoroughly mix '77 parts rubber, 112 parts asmately '77 parts rubber, 112 parts asbestos fiber, bestos fiber, 28 parts graphite, 28 parts zinc oxide, 28 parts graphite, 28 parts zinc oxide, and 42 parts 60 and 42 parts'sulphur (all being parts by weight). sulphur thoroughly mixed and treated with ap- Thereafter, we introduce the mixture into a proximately 368 parts of gasoline and 22 parts of cement churn together with 368 parts gasoline phenol resin t form a thoroughly dissolved uniand 22 parts of a phenolic resin, the latter being form paste-like mortar. preferably a compound made from phenol and MARION M. CUNNINGHAM.

formaldehyde. The mixture is stirred in the CHARLES E. BRADLEY. 55 

